Definition of gizmo noun from the Oxford Advanced Learner's Dictionary

 

gizmo

 noun
(also gismo)noun
BrE BrE//ˈɡɪzməʊ//
 
; NAmE NAmE//ˈɡɪzmoʊ//
 
(informal)(pl. gizmos, gismos)
 
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a general word for a small piece of equipment, often one that does something in a new and clever way It’s a new car, full of gadgets and gizmos. Word Origin 1940s (originally US): of unknown origin.
See the Oxford Advanced American Dictionary entry: gizmo